Decommissioned 31 July 1944 in Gotenhafen (today Gdynia, Poland) and cannibalized for spare parts. In early 1945 hulk was towed west to Stolpmünde (today Ustka, Poland) and captured there by Soviet forces on 9 March 1945.

Scuttled in late 1945 in Stolpmünde harbor by Russians after being inspected by the Tripartite Naval Commission (TNC) on 28 August 1945. Raised by the Polish harbor authority in 1950 and broken up in 1951.

There was another U-4 in World War OneThat boat was launched from its shipyard on 18 May 1909 and commissioned into the Imperial Navy on 1 Jul 1909. The Naval war in WWI was brought to an end with the Armistice signed on 11 Nov, 1918. Read about SM U 4 during WWI.